Automatic Reception And Manual Reception; Mechanism Of Radio Signal Reception; Rough Guide Of Radio Signal Reception Range: Japan (Jjy); Radio Signal Reception Range - Seiko S770 Instructions Manual

Setting the Time, Date and Day by receiving a radio signal

■ Mechanism of radio signal reception

2
The radio-controlled watch displays the precise Time, Date and Day by automatically
receiving and synchronizing itself with the radio signal of an offi cial standard frequency.
Transmitting
Station
Official standard
frequency
Cesium
Atomic Clock
Time signal transmitted by a standard frequency is based on a super accurate "Cesium
Atomic Clock" that may have a 1 second loss or gain per one hundred thousand years.
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Reception environment

■ Radio signal reception range

2
This watch can receive standard frequency signals of Japan (two transmitting stations), Germany,
the United Kingdom and the United States of America. By setting the city code of the home time, you
can choose the transmitting station from which the watch receives standard frequency signals.
→ How to set the home time city and dst (Daylight saving time) ⇒ P120
United
Kingdom
(MSF) P115
Germany
(DCF77) P114
112
Radio-controlled watch
Receive radio signals
through the antenna
inside the watch
↓
Analyze time
information
↓
Display the current
Time, Date and Day
Japan （JJY）
United States
P113
of America
（WWVB）P116

■ Automatic reception and manual reception

・ Automatic reception
This watch sets the time, date and day by automatically receiving a radio signal at a fi xed time. This watch
automatically receives a radio signal at 2:00 AM and 4:00 AM.
Automatic reception is carried out only when the watch is either in the TIME mode or in the WORLD TIME mode.
※ When this watch successfully receives a radio signal, it will stop automatic recetion.
・Place the watch in a place where it can easily receive a radio signal such as near a window.
・While the watch is receiving radio signals, do not move it.
→ To Improve radio signal reception P117
・ Manual reception
When this watch cannot automatically receive a radio signal due to a difficult
receiving environment, it is possible to receive them arbitrarily at any time.
→ How to conduct manual reception P156
※ Unless the city code of the home time is correctly set, the watch may fail to receive radio signals. Ensure that the
city code of the home time is correctly set. → How to check the settings of the watch (Miscellaneous information
display) ⇒ P106
※ The reception environment will often infl uence whether the watch successfully receives radio signals. → To Improve
radio signal reception ⇒ P117 → Conditions in which the watch may be unable to receive radio signals ⇒ P118
※ The watch is unable to receive radio signals outside the radio signal reception range → Radio signal reception
range ⇒ P112

■ Rough guide of radio signal reception range: Japan (JJY)

When TYO (Tokyo), SEL (Seoul) or HKG (Hong Kong) is selected for the city code
of the home time, the watch receives standard frequency signals of Japan.
Ohtakadoya-yama
transmitting
station (40 kHz)
Hagane-yama
transmitting
station (60 kHz)
Approximately
1,000 km
Approximately
1,000 km
※ Even if the watch is located within the radio signal reception range, the watch may fail to receive radio signals depending on its
receptoin environment which is often infl uenced by a combination of factors including weather, terrain, buildings, direction etc.
→ Conditions in which the watch may be unable to receive radio sigbnals ⇒ P118
111
JJY is operated by the National Institute of Information and
Communications Technology (NICT).
JJY is transmitted from two stations in Japan. Each station
transmits JJY in diff erent frequencies.
Fukushima (Ohtakadoya-yama transmitting station: 40 kHz)
Kyushu (Hagane-yama transmitting station: 60 kHz)
As a rough guide, radio signal reception range is within
an approximate radius of 1000 kilometers from the
transmitting station.
※ While the watch is receiving standard frequency signals of Japan
(JJY), the JP40 or JP60 indecator appears on the display
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